Commands you may need to solve this level

Helpful Reading Material

Write-up

I really didn’t use a proper method to solve this one. I used sort data.txt to get all data in a sorted manner so that all the repeated lines are together. Then I found out the odd one out through visual inspection. You can see below how easy it is to spot.

Hence I got the password.

Edit: Found a better method for this. The uniq command! When the data is sorted the -u flag can be used to print only the unique lines.